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The new flyover is being built to provide conflict-free crossing of the main line.

It is located in the busy Heathrow Airport Junction area, servicing trains to and from Heathrow as well as along the Great Western main line.

Carillion managing director for civil engineering Mark Davies said: “We are really pleased with the award of this contract, which follows our successful delivery of the Reading station area redevelopment track work contract and the advance works contract at Stockley.”

Even more trains will travel along the lines when Crossrail services begin in 2018, so work is needed to improve capacity in the area. Enabling work started on site this year.

In May, Network Rail and Crossrail agreed the £2.3bn funding package for Network Rail to carry out infrastructure and surface works to enable Crossrail services to Maidenhead, Heathrow, Abbey Wood and Shenfield.

He added that although he did not want to discourage innovation, he would be seeking contractors that were reliable, because “scope for doing things differently is more limited” due to the intense schedule of works.

Major contracts still to be awarded over the coming months include a deal for track works and overhead line equipment to be awarded this month.

Balfour Beatty, Costain, Kier, Skanska and Vinci will fight it out for two contracts to design and build 13 stations on the western section of Crossrail’s Acton Main Line to Maidenhead route.

Those contracts are due to be awarded in the spring of 2013, around the same time that Network Rail tenders contracts for design and construction of its north-eastern stations.

On the western spur, new station buildings are required at Acton Main Line, Hayes & Harlington, Southall and West Ealing and a major renovation at Ealing Broadway including an enlarged ticket hall, new footbridge, new lifts and pedestrianised forecourt.

The north-east section of Crossrail will include renovations at 13 stations, with station designs due to be formally submitted to the local authorities by early 2013.

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